Abstract
Pissodes terminalis Hopping attacks the current year's leader growth of lodgepole pine, Pinus contorta var. latifolia Engelmann (Pinaceae), causing its death or defects such as crooks, forks, and multiple leaders (Maher 1982). In southern British Columbia, the duration of the growing season can vary greatly among ecosystems as evidenced by the presence of several biogeoclimatic zones and subzones (Lloyd et al. 1990). In most of these zones, P. terminalis overwinters as fourth instar larva and adult emergence occurs the following season, thus requiring more than 1 year to complete its life cycle. However, in warmer ecosystems and in some silviculturally manipulated stands, its life cycle can be univoltine (Maclauchlan 1992; Cameron and Stark 1989). Knowledge of laboratory temperature requirements for P. terminalis development would enable future comparisons with field temperature accumulations and insect development.
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